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http://dx.doi.org/10.5394/KINPR.2003.27.6.631

A Study on Yaw-checking and Course-keeping Ability of Directionally Unstable Ships  

Sohn, Kyoung-Ho (Dept. of Ocean Systems Engineering, Korea Maritime University)
Yang, Seung-Yeul (Graduate School, Korea Maritime University)
Lee, Dong-Sub (Korea Institute of Maritime & Fisheries Technology)
Bae, Jun-Young (Graduate School, Korea Maritime University)
Abstract
Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards are reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMC criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.
Keywords
IMO′s ship manoeuvrability standards; Yaw-checking; Course-keeping; Simulator experiment; Manoeuvring difficulty;
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